Hot-air furnace.



Patented Apr. 22, I902.

W; H. BIBGE. HUT AIR FURNACE.

' (Application fllgfl July 5, 1901. v

(No Model.)

I V jNVEA TOR. v ZQiZZW/EQQWQ.

UNITED STATES PATENT .OFFICE.

" WILLIAM H. BIRGE, OF FRANKLIN, PENNSYLVANIA.

H OT- Al R FURNACE.

srnorrrcarrolv forming part of Letters Patent at. 698,170,

dated April 22, 1902.

Application filed uly 1901. .Serial No. 67,160. (No model.) I

, To all whorn it'may concern:

Be it known thatI, WILLIAM H. BIRGE, a citizen of the United States, residing at Franklin, in the county of Venango and State of Pennsylvania, have invented new and useful Improvements in Hot-Air Furnaces, of

which the following is a specification.

This invention appertains to air-heating furnaces; and it consists in the construction and arrangement of the parts whereina large number of hot-air tubes are inclosed within a rectangular casing,"said'easing having to one side of the same and between the hot-air tubes a perforated plate, the perforations or apertures aggregating in area an opening which is slightly larger than the exit-opening for the products of combustion, so that the heat will be retained and thefull eifect thereof utilized in heating the hot-air tubes, through which'the air passes to acylindrical top or distributing chamber, as will be hereinafter set forth.

In the accompanying drawings, Figure 1 is a vertical sectional view showing a hot-air furnace embodying my improvements. -Fig.- '2 is a plan view of oneof the top or bottom plates to which the hot-air tubes are connected. Fig. 3 is a front elevation of a perforated plate located within the rectangular casing.

A hot-air furnace made up in accord with my invention may be of the self-feeding type, i

and to this end a magazine A can be suitably attached or formed as a part of the furnace, and said fuel-magazine A has a contracted throat or, through which the fuel passes to the fire-pot B, below which is the grate and ash-pit. It will be noted that in the construction shown the throat or discharge opening of the magazine is toward the front of the furnace and. that the fuel will incline from the rear side of said throat to the rear edge of the the tubes D D, is preferably retangular in. cross-section and carries aledge or support (2,

upon which the bottom plate E rests, and bewarm as the smoke low said plate is a chamber F, into which cold air is admitted. The tubes D D are attached to the bottom plate E and to an upper plate E, which upper plate is of greater area than the casing C, so that its edges will bear thereon and support a dome or cylindrical top G,

' having anumber of openings to which hotair flues can be connected. The top or dome G may be bolted or otherwise connected to the top plate E, and the side walls may converge, so that the top is, as afmatter of fact, conical.

' H refers to a heat-restraining plate which extends from the bottom horizontal wall or plate E to the top wall or plate E, and the same is-provided with a number of perforations the combined area of which exceed the area of the smoke-pipe and opening I for the products of combustion, said opening being but a short distance above the bottom wall or plate E'of thefurnace.

The function of the heat-restraining plate .is to scatter and delaythe heat and products of combustion on. their way to the chimney, and for this purpose in a hot-air furnace having,' say, forty-nine hot-air tubes the plate H will be located between the second and third set of-tubes nearest the chimney or stovepipe.

In operation cold air passes from the chamber F and on its-way upward through the tubes is heated, and in its heated condition is carried to the hot-air fines. The products of combustion will keep the fines hot, and in practice these flues which are the hottest will tend to draw through the same the greatest amount ofv air, and by providing the plate H I utilize all the heat units from the fuel, as in practice the Stovepipe or chimney is hardly the same.-

and gases pass through I am aware that hot-air furnaces have been constructed with deflecting-plates to cause the products of combustion to take a circuitons route; but in my invention the heat is scattered, and instead of passing directlyto the chimney is divided by the restrainingplate.

I claim- 1. A hot-air furnace comprising a casing having to one side of the same a fire-potand' on the opposite side an exit for the products of combustion, a plurality of vertically-disposed hot-air tnbescarried by top and bottom plates, a dome or top for the reception of the heated air, and a perforated baflie or heat-restraining plate located within the casing and positioned nearer the opening for the exit of the products of combustion than to the fire-pot, substantially as shown.

2. In a hot-air furnace the combination with a casing having on one side a fire-potand opposite thereto an opening for the exit of the products of combustion said casing containing a plurality of hot-air tubes, at heatrestraining plate located within the casing and provided with numerous apertures the combined area of said apertures exceeding the area of the opening for the products of combustion, substantially as shown.

In a hot-air furnace, the combination of a casing which is rectangular in cross-section,

rectangular plates having attached thereto escape of the products of combustion located near the lower portion of the furnace and a fire-pot which opens into the casing on the opposite side from the escape-opening, substantially as shown. Y

In test-imon y whereof I have hereunto set my hand in presence of two subscribing witnesses.

WILLIAM H. BIRGE.

Witnesses:

W. W. Dawson, 'J. L. PARDoE. 

